Model Comparison

Claude Opus 4.6 vs GPT-5.5 Instant

Claude Opus 4.6 shows notably better performance in the majority of benchmarks. Claude Opus 4.6 is 1.1x cheaper per token.

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Performance Benchmarks

Comparative analysis across standard metrics

4 benchmarks

Claude Opus 4.6 outperforms in 3 benchmarks (AIME 2025, GPQA, MMMU-Pro), while GPT-5.5 Instant is better at 1 benchmark (CharXiv-R).

Claude Opus 4.6 shows notably better performance in the majority of benchmarks.

Wed May 06 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Claude Opus 4.6 costs less

For input processing, Claude Opus 4.6 ($5.00/1M tokens) costs the same as GPT-5.5 Instant ($5.00/1M tokens).

For output processing, Claude Opus 4.6 ($25.00/1M tokens) is 1.2x cheaper than GPT-5.5 Instant ($30.00/1M tokens).

In conclusion, GPT-5.5 Instant is more expensive than Claude Opus 4.6.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers
Wed May 06 2026 • llm-stats.com
Anthropic
Claude Opus 4.6
Input tokens$5.00
Output tokens$25.00
Best providerAnthropic
OpenAI
GPT-5.5 Instant
Input tokens$5.00
Output tokens$30.00
Best providerOpenAI
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Claude Opus 4.6 accepts 1,000,000 input tokens compared to GPT-5.5 Instant's 400,000 tokens. Both models can generate responses up to 128,000 tokens.

Anthropic
Claude Opus 4.6
Input1,000,000 tokens
Output128,000 tokens
OpenAI
GPT-5.5 Instant
Input400,000 tokens
Output128,000 tokens
Wed May 06 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Claude Opus 4.6 and GPT-5.5 Instant support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

Claude Opus 4.6

Text
Images
Audio
Video

GPT-5.5 Instant

Text
Images
Audio
Video

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

Claude Opus 4.6

Proprietary

Closed source

GPT-5.5 Instant

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Opus 4.6 was released on 2026-02-05, while GPT-5.5 Instant was released on 2026-05-05.

GPT-5.5 Instant is 3 months newer than Claude Opus 4.6.

Claude Opus 4.6

Feb 5, 2026

3 months ago

GPT-5.5 Instant

May 5, 2026

1 days ago

2mo newer

Knowledge Cutoff

When training data ends

GPT-5.5 Instant has a documented knowledge cutoff of 2025-08-31, while Claude Opus 4.6's cutoff date is not specified.

We can confirm GPT-5.5 Instant's training data extends to 2025-08-31, but cannot make a direct comparison without Claude Opus 4.6's cutoff date.

Claude Opus 4.6

—

GPT-5.5 Instant

Aug 2025

Provider Availability

Claude Opus 4.6 is available from Anthropic. GPT-5.5 Instant is available from OpenAI.

Claude Opus 4.6

anthropic logo
Anthropic
Input Price:Input: $5.00/1MOutput Price:Output: $25.00/1M

GPT-5.5 Instant

openai logo
OpenAI
Input Price:Input: $5.00/1MOutput Price:Output: $30.00/1M
* Prices shown are per million tokens

Outputs Comparison

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Key Takeaways

Anthropic
Larger context window (1,000,000 tokens)
Less expensive output tokens
Higher AIME 2025 score (99.8% vs 81.2%)
Higher GPQA score (91.3% vs 85.6%)
Higher MMMU-Pro score (77.3% vs 76.0%)
OpenAI
Higher CharXiv-R score (81.6% vs 77.4%)

Detailed Comparison

AI Model Comparison Table
Feature
Anthropic
Claude Opus 4.6
OpenAI
GPT-5.5 Instant

FAQ

Common questions about Claude Opus 4.6 vs GPT-5.5 Instant.

Which is better, Claude Opus 4.6 or GPT-5.5 Instant?

Claude Opus 4.6 shows notably better performance in the majority of benchmarks. Claude Opus 4.6 is made by Anthropic and GPT-5.5 Instant is made by OpenAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Claude Opus 4.6 compare to GPT-5.5 Instant in benchmarks?

Claude Opus 4.6 scores Vending-Bench 2: 100.0%, AIME 2025: 99.8%, Tau2 Telecom: 99.3%, Graphwalks parents >128k: 95.4%, MRCR v2 (8-needle): 93.0%. GPT-5.5 Instant scores HealthBench Consensus: 94.7%, OmniDocBench 1.5: 87.5%, GPQA: 85.6%, CharXiv-R: 81.6%, AIME 2025: 81.2%.

Is Claude Opus 4.6 cheaper than GPT-5.5 Instant?

Both models cost $5.00 per million input tokens.

What are the context window sizes for Claude Opus 4.6 and GPT-5.5 Instant?

Claude Opus 4.6 supports 1.0M tokens and GPT-5.5 Instant supports 400K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Claude Opus 4.6 and GPT-5.5 Instant?

Key differences include context window (1.0M vs 400K). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Opus 4.6 and GPT-5.5 Instant?

Claude Opus 4.6 is developed by Anthropic and GPT-5.5 Instant is developed by OpenAI.